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Yield Comparison Simulation between Seasonal Climatic Scenarios for Italian Ryegrass (Lolium Multiflorum Lam.) in Southern Coastal Regions of Korea

우리나라 남부해안지역에서 이탈리안 라이그라스에 대한 계절적 기후시나리오 간 수량비교 시뮬레이션

  • Kim, Moonju (Institute of Animal Life Science, Kangwon National University) ;
  • Sung, Kyung Il (Department of Animal Life Science, Kangwon National University)
  • 김문주 (강원대학교 동물생명과학연구소) ;
  • 성경일 (강원대학교 동물생명과학대학)
  • Received : 2022.01.21
  • Accepted : 2022.02.17
  • Published : 2022.03.31

Abstract

This study was carried out to compare the DMY (dry matter yield) of IRG (Italian ryegrass) in the southern coastal regions of Korea due to seasonal climate scenarios such as the Kaul-Changma (late monsoon) in autumn, extreme winter cold, and drought in the next spring. The IRG data (n = 203) were collected from various Reports for Collaborative Research Program to Develop New Cultivars of Summer Crops in Jeju, 203 Namwon, and Yeungam from the Rural Development Administration - (en DASH). In order to define the seasonal climate scenarios, climate variables including temperature, humidity, wind, sunshine were used by collected from the Korean Meteorological Administration. The discriminant analysis based on 5% significance level was performed to distinguish normal and abnormal climate scenarios. Furthermore, the DMY comparison was simulated based on the information of sample distribution of IRG. As a result, in the southern coastal regions, only the impact of next spring drought on DMY of IRG was critical. Although the severe winter cold was clearly classified from the normal, there was no difference in DMY. Thus, the DMY comparison was simulated only for the next spring drought. Under the yield comparison simulation, DMY (kg/ha) in the normal and drought was 14,743.83 and 12,707.97 respectively. It implies that the expected damage caused by the spring drought was about 2,000 kg/ha. Furthermore, the predicted DMY of spring drought was wider and slower than that of normal, indicating on high variability. This study is meaningful in confirming the predictive DMY damage and its possibility by spring drought for IRG via statistical simulation considering seasonal climate scenarios.

본 연구는 우리나라의 남부해안지역에서 가을장마, 혹한 및 봄 가뭄과 같은 계절적 기후시나리오 간 이탈리안 라이그라스(IRG: Italian ryegrass)의 건물수량(DMY: dry matter yield)을 비교하기 위해 수행하였다. 남부해안지역의 IRG 자료(n = 203)는 1993년부터 2013년까지 농총진흥청이 제주, 남원 및 영암에서 수행한 신품종 지역적응시험 결과보고서로부터 수집되었다. 계절적 기후 시나리오를 정의하기 위해 기상청으로부터 온도, 습도, 바람 등과 같은 기상정보를 사용하였다. 정상과 이상기후 시나리오를 구분하기 위해 5% 유의수준에서 판별분석을 수행하였다. 또한 IRG 수량비교는 표본분포의 정보를 기반으로 통계적 시뮬레이션을 수행하였다. 그 결과, 남부해안지역에서 봄 가뭄에 의한 DMY 차이만 뚜렷하게 나타났다. 혹한은 정상으로부터 분명하게 구분되었지만, DMY 차이는 나타나지 않았다. 따라서 DMY 비교는 봄 가뭄에 대해서만 시뮬레이션을 수행하였다. 그 결과, 정상 및 봄 가뭄 하에서 DMY (kg/ha)은 각각 14,743.83 및 12,707.97로 봄 가뭄 발생에 의한 예상피해는 약 2,000 kg/ha로 나타났다. 또한 봄 가뭄 하에서 예측 DMY는 정상시나리오에 비해 넓고 느리게 증가하여 변동성이 큰 것을 확인하였다. 본 연구는 계절별 기후 시나리오를 고려한 통계적 시뮬레이션을 통해 봄 가뭄에 의한 IRG의 DMY 피해 및 가능성을 확인한 것에 의의가 있다.

Keywords

Acknowledgement

본 논문은 과학기술정보통신부가 지원하는 한국연구재단을 통한 신진연구 프로그램의 지원에 의해 이루어졌습니다(NRF-2020R1C1C1004618).

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